<?php

/* SVN FILE: $Id$ */
/**
 * SassMixinNode class file.
 * @author      Chris Yates <chris.l.yates@gmail.com>
 * @copyright   Copyright (c) 2010 PBM Web Development
 * @license      http://phamlp.googlecode.com/files/license.txt
 * @package      PHamlP
 * @subpackage  Sass.tree
 */

/**
 * SassMixinNode class.
 * Represents a Mixin.
 * @package      PHamlP
 * @subpackage  Sass.tree
 */
class SassMixinNode extends SassNode
{

    const NODE_IDENTIFIER = '+';
    const MATCH = '/^(\+|@include\s+)([a-z0-9_-]+)\s*(?:\((.*?)\))?\s*$/i';
    const IDENTIFIER = 1;
    const NAME = 2;
    const ARGS = 3;

    /**
     * @var string name of the mixin
     */
    private $name;

    /**
     * @var array arguments for the mixin
     */
    private $args = '';

    /**
     * SassMixinDefinitionNode constructor.
     * @param object source token
     * @return SassMixinNode
     */
    public function __construct($token)
    {
        parent::__construct($token);
        preg_match(self::MATCH, $token->source, $matches);

        if (!isset($matches[self::NAME])) {
            throw new SassMixinNodeException('Invalid mixin invocation: ($token->source)', $this);
        }
        $this->name = $matches[self::NAME];
        if (isset($matches[self::ARGS]) && strlen($matches[self::ARGS])) {
            $this->args = $matches[self::ARGS];
        }
    }

    /**
     * Parse this node.
     * Set passed arguments and any optional arguments not passed to their
     * defaults, then render the children of the mixin definition.
     * @param SassContext the context in which this node is parsed
     * @return array the parsed node
     */
    public function parse($pcontext)
    {
        $mixin = $pcontext->getMixin($this->name);
        $context = new SassContext($pcontext);
        $context->content = $this->children;
        $argc = count($this->args);
        $count = 0;

        $args = SassScriptFunction::extractArgs($this->args, false, $context);

        list($arguments) = SassScriptFunction::fill_parameters($mixin->args, $args, $context, $this);
        $context->setVariables($arguments);

        $children = array();
        foreach ($mixin->children as $child) {
            $child->parent = $this;
            $children = array_merge($children, $child->parse($context));
        }

        // $context->merge();
        return $children;
    }

    /**
     * Returns a value indicating if the token represents this type of node.
     * @param object token
     * @return boolean true if the token represents this type of node, false if not
     */
    public static function isa($token)
    {
        return $token->source[0] === self::NODE_IDENTIFIER;
    }

}
